BJ vague-tweeted about having his heart broken by a girl in a way that, unfortunately for him, is subject to peer review. The particular peer here is the girl in question.
On one hand, this would be mortifying; on the other hand, BJ should be mortified.
The "Ruthless" joke is one I remember from effing "Swallows and Amazons", the ancient British children's book, where one of the protagonists calls herself Nancy instead of her given name Ruth, because she's a pirate and pirates are ruthless.